3-Port HDMI 2.1 Switch Important: ⚠️1) Qualified 8K HDMI 2.1 cables are recommended if you want to get an 8k signal. ⚠️ 2) The length of the HDMI cables connected to both ends of the switch should not exceed 3 meters respectively. ⚠️ 3) When power is from only one HDMI input, you will need to connect the supplied USB cable to feed additional power for the switch to work. ⚠️ 4) HDMI ATC certified Ultra High-speed HDMI 2.1 cables are needed to work with this 3-Port 8K HDMI 2.1 Switch. ⚠️ 5) the Remote Control battery is not included, and the battery model is CR2025.